div,
ul,
li {
    padding: 0;
    margin: 0;
    list-style: none;
}

li {
    display: inline-block;
    width: 80px;
    height: 80px;
    font-size: 58px;
    text-align: center;
    line-height: 80px;
    margin: 0px 0px -2px -2px;
    background-repeat: no-repeat;
    background-position: center center;
}